Check the easy/cheap things, first. The problem could very well be the fuel filter. You should be able to blow through it very easily. Check the O-rings along your turbo intake path. Make sure all of them are in place and are providing a good seal. It sounds like, possibly, one or more of your spark plugs may be fouling based upon what you said. Do a fuel injector flow test, too, since it appears of the spark plug fouling...